Seawater carbonate chemistry and net calcification during experiments with coral communities, 2009, supplement to: Andersson, Andreas J; Kuffner, Ilsa B; Mackenzie, Fred T; Jokiel, Paul L; Rodgers, Ku'ulei; Tan, A (2009): Net Loss of CaCO3 from a subtropical calcifying community due to seawater acidification: mesocosm-scale experimental evidence. Biogeosciences, 6(8), 1811-1823

• Main Authors: Andersson, Andreas J, Kuffner, Ilsa B, Mackenzie, Fred T, Jokiel, Paul L, Rodgers, Ku'ulei, Tan, A
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2009
• Subjects: Benthos; Calcification/Dissolution; Coast and continental shelf; Entire community; Field experiment; Mesocosm or benthocosm; North Pacific; Rocky-shore community; Tropical; Experimental treatment; DATE/TIME; Salinity; Temperature, water; Carbonate system computation flag; Oxygen; Nitrite; Nitrate; Ammonium; Phosphate; Silicate; Alkalinity, total; pH; Carbon, inorganic, dissolved; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Carbon dioxide; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Calcification rate of calcium carbonate; Experiment; YSI 30 salinty/conductivity/temperature meter; Calculated using seacarb after Nisumaa et al. 2010; Auto-analyzer, Technicon AA-II; Titration potentiometric; pH, Electrode; Calculated using CO2SYS; Calculated, see references; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Andreas; Pacific; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.727545; https://doi.pangaea.de/10.1594/PANGAEA.727545

Acidification of seawater owing to oceanic uptake of atmospheric CO2 originating from human activities such as burning of fossil fuels and land-use changes has raised serious concerns regarding its adverse effects on corals and calcifying communities. Here we demonstrate a net loss of calcium carbonate (CaCO3) material as a result of decreased calcification and increased carbonate dissolution from replicated subtropical coral reef communities (n=3) incubated in continuous-flow mesocosms subject to future seawater conditions. The calcifying community was dominated by the coral Montipora capitata. Daily average community calcification or Net Ecosystem Calcification (NEC=CaCO3 production - dissolution) was positive at 3.3 mmol CaCO3 m-2 h-1 under ambient seawater pCO2 conditions as opposed to negative at -0.04 mmol CaCO3 m-2 h-1 under seawater conditions of double the ambient pCO2. These experimental results provide support for the conclusion that some net calcifying communities could become subject to net dissolution in response to anthropogenic ocean acidification within this century. Nevertheless, individual corals remained healthy, actively calcified (albeit slower than at present rates), and deposited significant amounts of CaCO3 under the prevailing experimental seawater conditions of elevated pCO2. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI).